Hydraulic transmission, Li Yifan already has a draft, in the next ten years, with the 6-speed automatic transmission from DSI, it is actually enough.

After all, he is a person who has come from the past and knows well the situation of the domestic automobile market more than ten years later, even at that time, when the automatic transmission was still the mainstream product, occupying more than 30% of the market share.

And high-end transmissions like 8th or even 9th gears can still only stay in high-end luxury models.

Such a multi-gear hydraulic transmission, want to popularize downward, a little not smooth, one is because the eight-gear or even nine-gear hydraulic transmission has many gears, and the computer logic program requirements, processing accuracy requirements are high, large volume, so the cost is high, and the automatic transmission of 6 gears does not have advantages.

So in the field of hydraulic automatic transmissions, 6 gears are sufficient.

And judging from his identity as a person who has come over, in the automatic transmission market, dual-clutch transmissions and CVTs cannot be underestimated.

Dual-clutch transmission, although the public stumbled and had many problems, but the Germans relied on the money they got from the Chinese market to eat this technology thoroughly, and later upgraded it many times, although there were some flaws, but it was also proven.

And like the development of higher gears, the dual-clutch is undoubtedly more advantageous than the hydraulic automatic transmission, with simpler structure, light weight, fast gear shifting, less frustration, etc.

Another transmission that has been proven is the CVT transmission, which has never been favored before, which is the so-called continuously variable transmission.

This kind of transmission was actually made by Mercedes-Benz as early as 100 years ago. However, at that time, there were many unavoidable problems due to material problems, and they were finally abandoned by Mercedes-Benz.

It wasn't until the sixties and seventies of the last century that it was picked up by the Japanese, but it was soon abandoned.

And his third revival is inseparable from the persistence of Nissan and Jetko.

As we all know, there are only a few companies in the world that have complete automatic transmission R&D and production, ZF, Aisin, and DSI. Any other company that remains. If you want to enter the market of hydraulic automatic transmissions, you can't get around the patent blockade of these companies.

As a result, Volkswagen was forced to engage in dual-clutch transmission, and Jetco had no choice but to focus on CVT in the end.

Since 1992 of the last century, Jetco has relied on the support of Nissan. The continuously variable transmission has been improved. Several generations of products have been launched in a row. It has been used in Japan for a long time.

It is enough for small displacement models, but this kind of transmission has a congenital defect, that is, it cannot be used in performance cars. Because if the engine is too strong, the CVT will face the problem of starting slippage.

And the problem of wear and tear is also inevitable, after all, the principle of this transmission is to rely on friction to transmit power, although its smoothness is the best of all automatic transmissions, but its durability is also the worst.

Early CVT products, on average, had to be overhauled after an average of 40,000 kilometers, which was definitely a lot of money for consumers.

Therefore, Nissan has not taken care of the promotion of this product, knowing that in recent years, they have updated a lot of technology, and after making a major breakthrough in wear-resistant materials, they began to quietly popularize this transmission in their own products.

A few years later, when they launched the seventh-generation CVT and the eighth-generation CVT, their CVT development had reached the point of tending to be a big deal.

So in the current situation, although CVT has many shortcomings of one kind or another, the prospect is still very impressive.

So of course Li Yifan didn't plan to let go of such a product, and this product was Zhou Yuanchao, who originally planned to get it.

When Li Yifan and Zhou Yuanchao mentioned the CVT transmission, Zhou Yuanchao immediately began to talk about his opinions on this product.

Because CVT transmissions, as early as the beginning of the last century, were made by the Germans, and now nearly a hundred years have passed, so there is no such thing as a patent.

If you work on CVT transmissions, the structure is the same, but some details have been adjusted, such as the transmission belt, which has been replaced with a variety of steel chains.

There are also small fine-tuning in the active and driven wheels, in short, each has its own unique skills.

Now in Europe and the United States, that is, Volkswagen and Audi in Germany, are still playing with CVT transmissions, and some time ago Audi had a car, which used CVT transmissions, and of course the transmission chain was provided by Luke.

Japan's Fuji Heavy Industries also uses the chain provided by Luke.

However, Nissan is taking a different approach in this regard, and the current situation is that Audi uses a better CVT than theirs, but it will not be long before they will make a technical upgrade, and they will change the transmission chain to steel plates.

In the past, the transmission mode of CVT was to rotate the driving wheel, drive the chain, and then pull the driven wheel, so as to achieve the purpose of transmission.

However, after they changed it, it became a driving wheel to rotate, pushing the steel chain and then pushing the driven wheel.

Don't underestimate this simple pull, and push, just such a smile change, so that the CVT transmission, in terms of durability has been greatly improved.

And there has been a great improvement in transmission efficiency, the previous CVT transmission, can not withstand large torque, and so on, relying on such a small change, it is improved by at least three steps.

So when Li Yifan told Zhou Yuanchao his thoughts, Zhou Yuanchao slapped his thigh even when he heard it.

He wanted to engage in CVT before, mainly because in the past two years, the CVT models launched by Nissan have become more and more popular in the market, and even a little spark, which is bound to burn the prairie fire.

That's why he wants to emulate Nissan, after all, CVTs look easier to do than hydraulic transmissions.

And Li Yifan's idea was put forward, for him, it was simply a feeling of finding a different way and being unique.

After all, Nissan didn't have such a concept in these years, and they really made the CVT to the seventh generation, which was a few years later, and now they are just a little annoyed by the steel chain CVT launched by Audi.

"Boss, your idea is very good, but this idea has high requirements for steel sheet material, right? After all, this steel sheet has to work in such a high-temperature environment, to ensure the life span, to ensure the transmission efficiency, which is not the usual requirements for the material. ”

Zhou Yuanchao is worthy of being an expert in this industry, and he asked the idea in one sentence.

The reason why Nissan waited until a few years later to take out the seventh-generation CVT was because of the material, not because there was no material, but because it didn't know what kind of material was most suitable.

Therefore, countless hours have been wasted in the continuous experiments, but this problem is not a problem at all for Li Yifan now.

"I use fully hardened high-carbon chromium steel, which I have verified in the laboratory in the United States, which is very wear-resistant, anti-manufacturing, and in a high-temperature, high-corrosion environment, continuous high-strength work is not a problem. If you use it to make the kind of steel you said, you won't have a problem driving 200,000 kilometers......"

Li Yifan casually braged nonsense, anyway, Zhou Yuanchao It is impossible for them to really understand his background, and his background has always been mysterious in the eyes of these people.

At such a young age and with so much money, it is not impossible to set up a laboratory in the United States to have fun.

What's more, people even have special metal smelting companies even read it, this is real, this is not always bragging, right?

Zhou Yuanchao has never seen the kind of fully hardened high-carbon chromium steel that Li Yifan said, but it sounds like it should be a very bullish thing, and it can be heard from the name alone, this material of steel must need a special smelting mode, and it also needs the addition of various elements, and it must belong to high-grade special steel.

About this special steel, Li Yifan didn't know, but more than ten years later, Nissan was a little conscientious, they set up a transmission factory in a city in China, so he knew this material, although this material could not be produced in China at that time, he could only rely on imported products from Japan to assemble.

But now this problem is not difficult for him, as long as he knows the material of that metal, with his current ability, even in China, he can completely figure it out.

"There is another question, that is, if the pushing steel sheet is used as the main body of conduction, how to adjust the relaxation and tension of the steel belt?"

Zhou Yuanchao is really old and spicy, since Li Yifan has solved the problem of materials, he will no longer be entangled.

But I quickly thought of another key, in the past, it was used in a pull mode, so there was no need to worry about the tightness of the steel chain, but if you use pushing, it will be different.

After all, the coordination of the active and driven wheels is different from the original, so don't look at it as just a small fine-tuning, but the internal operation of the entire transmission mechanism needs to be changed.

Li Yifan smiled wickedly at this time: "You add a set of gear shift mechanisms to this part, that is, add a set of planetary gears to work with the original CVT, so as to increase the range of the gearbox of the transmission, and also reduce the volume of the gearbox, so that it works more effectively......"

Li Yifan dialed it casually, and immediately made Zhou Yuanchao's eyes shine, I damn it, such a simple method, why didn't I think of it before?

By the way, with such an institution, doesn't this solve a lot of problems? Damn, that's a great idea.

There was a burst of ecstasy in Zhou Yuanchao's eyes, for a technical nerd like him, Li Yifan's on-demand broadcast was like a panacea, with the wonderful use of turning decay into magic. (To be continued......)